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Raster Data

Georeference, analyze and transform gridded data

Functions

maprefcellsReference raster cells to map coordinates
maprefpostingsReference raster postings to map coordinates
georefcellsReference raster cells to geographic coordinates
georefpostingsReference raster postings to geographic coordinates
georasterrefConstruct geographic raster reference object
maprasterrefConstruct map raster reference object
makerefmatConstruct affine spatial-referencing matrix
refmatToGeoRasterReferenceReferencing matrix to geographic raster reference object
refmatToMapRasterReferenceReferencing matrix to map raster reference object
refmatToWorldFileMatrixConvert referencing matrix to world file matrix
refvecToGeoRasterReferenceReferencing vector to geographic raster reference object
worldFileMatrixToRefmatConvert world file matrix to referencing matrix
geopeaksGenerate synthetic data set on sphere
geointerpGeographic raster interpolation
mapinterpMap raster interpolation
geocontourxyContour grid in local system with latitude-longitude results
geoloc2gridConvert geolocated data array to regular data grid
imbedmEncode data points into regular data grid
ltln2valExtract data grid values for specified locations
mapoutlineCompute outline of georeferenced image or data grid
resizemResize regular data grid
limitmDetermine latitude and longitude limits of regular data grid

Using Objects

GeographicCellsReferenceReference raster cells to geographic coordinates
GeographicPostingsReferenceReference raster postings to geographic coordinates
MapCellsReference Reference raster cells to map coordinates
MapPostingsReference Reference raster postings to map coordinates

Examples and How To

Generate Shaded Relief Map using Raster Data

This example shows how to generate a shaded relief map using raster data, also known as a data grid.

Determine Area Occupied by Logical Grid Variable

This example shows how to determine the area satisfying one or more conditions using logical grid manipulations.

Compute Elevation Profile Along Straight Line

This example shows how to compute an elevation profile along a straight line using the mapprofile function.

Compute Gradient, Slope, and Aspect from Regular Data Grid

This example shows how to compute the gradient, slope, and aspect for a regular data grid.

Define Geolocated Data Grid

A geolocated data grid is defined by three matrices giving latitude and longitude coordinates and indices associated with the mapped region.

Constructing a Global Data Grid

Imagine an extremely coarse map of the world in which each cell represents 60º.

Computing Map Limits for Regular Data Grids

The latitude and longitude limits of a regular grid are among the most important properties of its referencing object.

Geographic Interpretation of Grid Cells

You can access and manipulate gridded geodata using either geographic or intrinsic raster coordinates.

Precompute the Size of a Data Grid

Before making a large, memory-taxing data grid, you should first determine what its size will be.

Concepts

Raster Geodata

Raster geodata represents map data in matrix format.

Data Grids as Logical Variables

Perform logic tests on data grid variables to create a binary logical grid.

Types of Data Grids and Raster Display Functions

Mapping Toolbox™ functions and GUIs display both regular and geolocated data grids originating in a variety of formats.

Geographic Interpretations of Geolocated Grids

The dimensions of a map matrix and associated latitude and longitude matrices determines the interpretation of the geographic map data.

Georeferenced Raster Data

Structure and application of referencing vectors and referencing matrices

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